as sal castaneda reports, governor brown took a ride in a self-driving car today to welcome who could be a new era in transportation. >> reporter: perhaps to drive home the point, governor jerry brown arrived today at google in a self-driven toyota prius. he then went inside to sign a bill for driverless cars to become legal. >> pioneering the future and leading not just the country but the whole world. >>> - - >> reporter: the new law will require safety standards including requiring a human being inside. but that may eventually change according to google cofounder sergey brin. >> you can have a car drop you off here to work. get out, walk through a little bit of green space and it goes off and takes somebody else some where else. >> reporter: he says driveless cars can potentially reduce the demand for parking. engineers say driverless cars may not be subject to what causes most automobile crashes, human error. >> i expect that self-driving cars are going to be much safer than driverless cars. >> just because they say it's safe, don't mean mechanically something can't go wrong. >> s